During the academic year 2015-2016, I organized the weekly seminar Groups, Actions and von Neumann algebras at the Université Paris-Sud, Orsay. This seminar featured both research and introductory talks.
Meetings
Thursday October 8
Amaury Freslon (Université Paris-Sud)
Introduction to C*-simplicity for discrete groups
Thursday October 22
Amine Marrakchi (ENS Paris and Université Paris-Sud)
Furstenberg and Hamana boundaries of discrete groups (Part I)
Thursday November 12
Amine Marrakchi (ENS Paris and Université Paris-Sud)
Furstenberg and Hamana boundaries of discrete groups (Part II)
Cyril Houdayer (Université Paris-Sud)
C*-simplicity and the unique trace property for discrete groups (after Breuillard-Kalantar-Kennedy-Ozawa) (Part I)
Thursday November 19
Cyril Houdayer (Université Paris-Sud)
C*-simplicity and the unique trace property for discrete groups (after Breuillard-Kalantar-Kennedy-Ozawa) (Part II)
Thursday November 26
Arnaud Brothier (Vanderbilt University)
Approximation properties and subfactors
Thursday December 3
Yves de Cornulier (CNRS and Université Paris-Sud)
Groups of tree automorphisms with an almost everywhere prescribed action
Thursday December 17
Yuhei Suzuki (The University of Tokyo)
Minimal ambient nuclear C*-algebras
Thursday January 7
Cyril Houdayer (Université Paris-Sud)
Bi-exact groups, strongly ergodic actions and group measure space type III factors with no central sequence
Thursday January 21
Romain Tessera (CNRS and Université Paris-Sud)
A functional analysis proof of Gromov’s polynomial growth theorem (after Ozawa) (Part I)
Monday January 25
Romain Tessera (CNRS and Université Paris-Sud)
A functional analysis proof of Gromov’s polynomial growth theorem (after Ozawa) (Part II)
Monday February 1
Jean Lécureux (Université Paris-Sud)
Bader-Shalom’s normal subgroup theorem (Part I)
Monday February 8
Jean Lécureux (Université Paris-Sud)
Bader-Shalom’s normal subgroup theorem (Part II)
Monday February 29
Koichi Shimada (The University of Tokyo)
Examples of maximal amenable subalgebras in free group factors arising from irrational rotation algebras
Monday March 14
Rémi Boutonnet (CNRS and Institut de Mathématiques de Bordeaux)
II_1 factors with non-isomorphic ultrapowers
Monday March 21
Sven Raum (WWU Münster)
C*-simple and non-C*-simple locally compact groups
Monday April 4
Camille Horbez (CNRS and Université Paris-Sud)
An introduction to Out(Fn)
Monday April 11
Camille Horbez (CNRS and Université Paris-Sud)
The Poisson boundary of Out(Fn)
Monday June 20
Hiroshi Ando (Chiba University)
Unitarizability, Maurey-Nikishin factorization and Polish groups of finite type